I Ching, "the Book of Changes"

The Chinese Book of Change - is one of the most ancient books in existence - some of it is 5000 years old.

The traditional manner of consulting the I Ching was to throw a
bundle of yarrow sticks. The sticks are thrown six times. Each
throw, through its combination of odd or even sides - head
or tails - yields a particular result, called a 'line'.

Chinese coins represent the powerful union of heaven and earth.
Described as being "square within and round without".